Composition of matter for plastering.



I also pre are seplarately a small UNITED STATES PATENT OFFICE. BURTON E. NOBLE, OF SPRINGFIELD, MASSACHUSETTS.

COMPOSITION OF MATTER FOR PLASTERINGr Specification of Letters Patent. Application filed August 31, 1906. serial Rd- 382,771.

To all whom it may concern:

Be it known that I, BURTON E. NOBLE, of Springfield, in the count ofIIampden and State of Massachusetts,- ave invented certain new and useful Improvements in a Com osition of Matter for Plastering, of which the following is a specification.

This invention relates to an improved composition of matter for plastering walls, ceilings, and similar uses and the process of making the same.

The object of the invention is to improve upon the plastering at present in use in several respects, among which are to decrease the conductivity of sound and of heat, to eliminate the tendency to crack or to chip under a blow, to improve the fireproof qualities, and to reduce the cost both in the item of component materials and in the item of 'labor expense for preparing and applying the composition to a wa Hitherto inventors seeking to im rove. the art to which this relates have thoug t it necessary to emplo plaster-of-paris as one component, which as the disadvantagethat it sets quickly and cracks in hardening and requires a restrainer to make it workable, and frequently in order to prepare a mixture which can be stored ready for use they employ slaked lime as an ingredient, subsequently applyin water to make the mass plastic; but pro ucts formed by this method ave the ob'ectjon of lacking strength.

It is anot er object of the present invention to produce a laster which dries more slowly and. when ry is stron er and is mternally bound together more mly than is true of either of these types. Y

In carrying out the invention I employ as the main basis of the composition ground or pulverized asbestos, which may be obtained as the waste product of asbestos-mines, and I mixwith. this a small quantity ofsand, preferably beach-sand, although other finely-comminuted rock will serve, and'a small quantity of fibrous material, preferably asbestos fiber. uantity of unslaked ime. hus prepared, lie ingredients may be stored ready for convenient use when needed and do not suffer by lapse of time. When ready to use, the lime is slaked with water, the mixture first described is immediately added, and the whole is thoroughly intermixed and brought to a proper consistency. The mass can be retained in this condition a convenient time to allow for mixing asbestos powder and a transportation sizable quantity from a central mixing plant'to the dplace where needed for use and can be applie comfortably to the work with trowel and darby. As thus constituted by far the largest constituent of the composition is the pulverized asbestos waste. Considering its superior specific gravity, the

v l atented Nov. 18, i906.

sand occupies a very minor part of the volume. The sand may be omltted, a suitable additional amount of pulverized asbestos being substituted; but the best effect is ob tamed as indicated. Without the sand the roduct will have firm and elastic ualities, but will not fiow with readiness into t e interstices of laths or whatever other surface is to receive the composition. I have discovered that the addition of a little sand renders the composition more fiuid in that res cot/eliminates a certain suction that is ot erwise noticed in working it, and im roves the darbying process, making the and enabling the composition to be spread .with security over a greater surface. The

ollows, by weight: pulverized asbestos, thirty-four parts; asbestos fiber, one part; sand, six parts; lime, five parts.

' .The foregoing proportions may be varied to some extent; but in general t ey express the combination and proportion of ingredients which I have found effective for accomplishing the said objects. The two kinds of asbestos and the sand may be mixed by machinery. Some other kind of fiber may be substituted for the asbestos fiber; but the structural similarity of the two ingredients when both kinds of asbestos are employed results in a eculiarly' intimate relationship in the interna structure of the finished product. The result is a product which when (1137 is firmly united, is elastic when subjecte to blows, is incombustible, and a non-conductor both of heat and of sound, adhering strongly to the wall on which it is set, and not subject to cracks nor liable to chip off when nails are driven into it.

Although herein described as it may be applied to walls or ceilings, the plaster may with equal facility be formed into slabs or blocks by the use of molds or otherwise.

I claim 1. A plastering composition formed by fibrous material with fresh wet slaked lime, substantially as described.

2. A plastering composition formed by arby run clearer roportions which I have found best are as imxmg asbestos powder, afibrous material, mixture thereto while wet, substantially as and a small proportion of sand with fresh wet described. [0

slaked lime, substantially as described. In testimony whereof I have afiixed my 3. The process of forming a plastering comsignature in presence of two witnesses. L pound consisting in preparing separately a BURTON E. NOBLE.

mlxture of asbestos powder, sand and fiber; Witnesses: and a quantity of unslaked lime; and then CHAS. L. YOUNG, slaking the e with water and adding the LQT'rIE A. DOWNING. 

